Jumps out of 2nd under hard acceleration

[roscoe G coltrane]

I've got a 82 650 G with 30K. Runs great, but when I really jump on the throttle from 1st to 2nd, it will jump out of 2nd. I've adjusted the clutch cable and the clutch and basket were brand new when I got it about 6 K ago.I'm now thinking its something in the gearbox, but I've never had a bike tranny apart before, so I don't know what to look for. Could anybody tell me what and how to check for the problem? also how hard would it be to replace the worn parts? thanks, RGC.

[Billy Ricks]

Most like a bent shifting fork. There are three of them in your tranny. you have to spilt the cases to fix it. If you have to go there I can send you pages from my service manual to help you out.

[roscoe G coltrane]

Thanks Billy, sounds like a good winter project to me. As long as I keep it under 7K in 2nd it does fine. Its still decent riding weather here in NC, but around december or january I will probably tear it down and replace those forks. I'll PM you for those pages when its time. Thanks again for your helpRGC

[the_journeyman]

My 1150 does that too. Only it jumps of you dump the thotttle after hard acceleration. I was suspecting a bent fork, looks like I was on the right track ~

JM

[spchips]

Very common issue on the 650's

I had one that did it at about 8K rpm at 25,000 mi

I swapped the entire trans with a low mileage unit at 45,000 mi, when it had started doing it at ~5-6K rpm.

Now it does it at 8500k rpm.